diff --git a/controller/Root.py b/controller/Root.py
index 9d1f23b..6687f01 100644
--- a/controller/Root.py
+++ b/controller/Root.py
@@ -239,6 +239,7 @@ class Root( object ):
     return result
 
   @expose( view = Main_page )
+  @strongly_expire
   @grab_user_id
   @validate(
     user_id = Valid_id( none_okay = True ),